I never did.
The only game I have installed on XB1 is Recore, and it was 7.6 GB. I have roughly 770 GB free space left.
You literally only have one game on your XB1? seems kinda like a waste.
Oldgamers- Most XB1 games aren't that size. many indy titles are under 1GB, however, most "Major" AAA games now are quite large. I have 47 games on my main Xbox one that are over 50.0 GB, and 302 games that are 5.0 GB or less- out of 713 games currently installed. On my 2nd Xbox I have my largest game though, Modern Warfare 2019 which clocks in at a whopping 150 GB. Absolutely insane. I def miss the way the 360 did it.
To answer your question- Yes, MOST Xbox 360 games can be installed onto your hard drive- which makes them run smoother and saves wear and tear on your HD....When you have the game in your drivee, but are on the main home screen, go to the box with the game and select information. It will then give you the option to install the game. You will still need the disc to play, but it doesn't spin in the drive. You are actually playing off the HD with the disc serving as an authenticator basically. Same basic idea as XB1, except you HAVE to install all XB1 games on your HD, where on the 360 you don't. I believe there are a small handful of games you can't install, but I can't say with 100% certainty.
Edit: I see you already answered the question yourself